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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc47ef5b6e11e29f1ee4e73df14d6f2e492ba0bf4fa380f596e9e4283504e0c' 
  AND token = 'yXUZYlscItn4PWvbVsALBhs9p7Wo9UC/CbCFfjRZUTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}